Pencil sharpener



FIG. 1 is a perspective view of a pencil sharpener showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left view thereof;

FIG. 5 is a right view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof; and,

FIG. 8 is another perspective view thereof.

The broken lines on the top in FIG. 6 and on the bottom in FIG. 7 are included to show portions of the pencil sharpener that form no part of the claimed design. 

The ornamental design for a pencil sharpener, as shown and described. 